This study presents a hybrid photovoltaic (PV) solar cell consisting of zinc phthalocyanine (ZnPc) on nanoporous gallium arsenide (GaAs) substrates (NPGSs). NPGSs with a low reflectivity are prepared by metal-assisted nanoscale lithography. Au nanoparticles (GNPs) are introduced into the nanoporous structure in organic/inorganic hybrid solar cells to enhance the perfornance of photovoltaic devices. The optimal measured parameters of the PV cell with the ITO/ZnPc + I-2 + PMMA (ZIP)/GNPs/NPGS/In structure are J(sc), V-oc, fill factor (FF), and power convert efficiency (PCE), which have values of 2.48 mA/cm(2), 0.55 V, 0.197, and 2.69%, respectively, under irradiation by a 100 W xenon lamp. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.087112jes] All rights reserved.